chore(main): release 2.12.0

[LarsCowe]

🤖 I have created a release beep boop

2.12.0 (2026-04-06)

Features

• implement: Updated Planning artifact detection to use _bmad/config.yaml first (#138) (c2f12ac)
• ralph: add write heartbeat to detect and break read-only loops (#146) (9d0b158)
• run: append-only loop performance metrics (#129) (7bdebf8)
• run: inject specific test failures into loop context (#119) (186c3ff)
• run: swarm mode — parallel multi-agent implementation (#155) (d7858db)

Bug Fixes

• correct readiness hint, detect corrupted config, preserve CRLF, dedupe computation (edeaacd)
• resolve CI failures from CLAUDE.md slim-down (526be14)
• security: validate RALPH_DIR, parse .ralphrc safely, check PLATFORM_DRIVER (#76, #77, #79) (9bc7cc1)

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